Debian/firefox-esr: medium 4
When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird
Action: Upgrade firefox-esr to 128.6.0esr-1 or later.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 128.6.0esr-1 | - |
Fixed versions
| 128.6.0esr-1 |
Sources
- osv: DEBIAN-CVE-2025-0239#Debian:14/firefox-esr
- https://security-tracker.debian.org/tracker/CVE-2025-0239
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